EP0441575A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Color image processing apparatus

Assignee: Konica Minolta Inc

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Filing: 1991-02-04

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Granted: —

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Expires: 2011-02-04

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Abstract

Abstract The apparatus comprises: means for reading an image (1-3) on an original as three color-separated images; means for generating a color code (9) indicating whether each pixel of the color-separated images is white, achromatic, or chromatic; means for converting each of said color-separated images into density data depending on the recording color thereof; means for detecting a marker on the image on the original based on the color codes generated by said color code generating means, and extracting a marker area enclosed by the marker; and marker color converting means (30) for propagating density data determined at a point sampled on a scanning line in the marker area, pixel by pixel in a main scanning direction and propagating density data determined on a preceding scanning line in an auxiliary scanning line, whereby the density data at the sampled point and the color of the marker at the sampled point are regarded as the density data and the color of the marker throughout the marker area.

Inventors

👤 Takashi Hasebe
👤 Seiichiro Hiratsuka
👤 Tadao Kishimoto
👤 Kazuyoshi Tanaka
👤 Koji Washio
👤 Tetsuya Niituma

Bibliographic Details

Application Number —

Jurisdiction EP

Data Source google_patents

Last Synchronized 2026-11-09 11:12

CPC Classifications

H; H04; H04N; H04N1/00; H04N1/46; H04N1/56; H04N1/60; H04N1/62; H04N1/626; H04N1/38

Claims Analysis

Total Claims: 5

Claim 1

Independent Claim 181 words

A color image processing apparatus comprising: image reading means for reading an image on an original as three color-separated images; color code generating means for generating a color code indicating whether each pixel of the color-separated images read by said image reading means is white, achromatic, or chromatic; color reproducing means for converting each of said color-separated images into density data depending on the recording color thereof; marker area detecting means for detecting a marker on the image on the original based on the color codes generated by said color code generating means, and extracting a marker area enclosed by the marker; and marker color converting means for propagating density data determined at a point sampled on a scanning line in the marker area, pixel by pixel in a main scanning direction and propagating density data determined on a preceding scanning line in an auxiliary scanning line, whereby the density data at the sampled point and the color of the marker at the sampled point are regarded as the density data and the color of the marker throughout the marker area.

Claim 2

Dependent Claim 21 words

A color image processing apparatus according to claim1 wherein said color reproducing means includes a linear masking circuit for reproducing color.

Claim 3

Dependent Claim 19 words

A color image processing apparatus according to claim 2 wherein said linear masking circuit is composed of ROM table.

Claim 4

Dependent Claim 64 words

A color image processing apparatus according to claim 1 wherein sai marker area detecting means comprises a marker break correction circuit for correcting a blur or break in a marker portion in both main and auxiliary scanning directions and a marker area processing circuit for generating a marker area signal representative of an area defined by a marker signal corresponding to the color code.

Claim 5

Dependent Claim 97 words

A color image processing apparatus according to claim 4 wherein said marker color converting means includes a marker color sampling unit for outputting a sampling signal by sampling the density data of the marker color while said marker area signal is provided; a marker sampling monitoring unit for determining on the basis of the color code whether the sampling of the marker color is effective or not and producing a monitor signal and means for determining the density of the marker color on the basis of the marker area signal, the sampling signal and the monitor signal.

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